New patch for the game came out sooner than I had expected, and with it came some price reductions. I was going to wait until I reached 500 Vg coins before buying the Sucker Punch so the progess on my Ninja wouldn't suffer, but this new patch made it more affordable now.

Sucker Punch reduced from 15 Vg to 15 Nd coins. (Edit: Why did I think it was 25 Vg?)
Sacred Tome of Death Pact reduced from 75 T to 10 T slayer points.

Recorded with NVIDIA GeForce Experience.